Bowl liner securing device



United States Patent Arnold P. Szoj Hales Corners, Wisconsin Jan. 19,1968 Nov. 10, 1970 Nordberg Manufacturing Company Milwaukee, Wisconsin acorporation of Wisconsin inventor Appl. No. Filed Patented Assignee BOWLLINER SECURING DEVlCE 6 Claims, 2 Drawing Figs.

11.8. CI. 241/299 int. Cl......, 1302c 2/04 Field oi Search 241/299,

Primary Examiner-Robert C. Riordon Assistant Examiner-Donald G. KellyAttorney-Parker, Carter & Markey ABSTRACT: A device for securing a linerto the bowl of a gyratory crusher machine. A disposable element supportsa locking member in engagement with a flange on the liner so that upondestruction of the element the liner may be rapidly unlocked and removedfrom the bowl.

BOWL LINER SECURING DEVICE SUMMARY OF THE INVENTION In gyratory conecrusher machines, the wearable liners for the crusher bowl and head mustbe replaced as the liner material wears thin. It is important to reducethe downtime during the liner replacement operation to increase theoperating time for each machine and improve the efficiency of thecrushing operation. It has been found difficult to rapidly remove theliner from the bowl because during the crushing operation the largereactive forces against the liner tend to bind the locking elements,making it difficult to unlock the liner. Furthermore, the dust createdduring crushing tends to settle around the locking elements andinterfere with the unlocking operation.

Accordingly, it is an object of this invention to provide means forlocking a liner to the bowl of a gyratory crusher which facilitatesrapid unlocking of the liner to reduce the downtime during linerreplacement.

Another object of this invention is to provide a device for locking aliner to the bowl of a gyratory crusher in which a disposable element ispositioned to support a liner locking member, such as a locking wedgeengaging a flange on the liner, so that the support element may berapidly destroyed to release the locking force of the locking member.

Another important object of the present invention is to provide a wedgemember for locking a liner to the bowl ofa gyratory crusher with adestructible element such as a length of nonyieldable materialpositioned to releasably support the wedge preventing outward radialmovement thereof with respect to the liner. Means are provided betweenthe support element and wedge to move the wedge inwardly into lockingengagement with the liner. Destruction of the support element loosensthe wedge so that it may be readily moved out of locking engagement withthe liner to facilitate rapid liner change.

Still another object is to provide a bowl liner locking device for agyratory crusher having a plurality of locking wedges which engage theliner flange and which carry a bolt for moving the wedge inwardly. Adisposable element such as an ordinary steel bar is positioned between acylindrical outer portion of the bowl and the outer end of the bolt toprevent radial outward movement of the wedge. This assembly permitsrapid unlocking of the wedges from the liner flange by means of cuttingthe support elements. When a new liner is in place, the wedges may bereassembled simply by inserting a new support element between the outerbowl portion and the wedge bolts.

DESCRIPTION OF THE DRAWINGS FIG. I is a side elevation view in crosssection of a portion of a gyratory crusher machine illustrating detailsof the invention; and

FIG. 2 is an enlarged side elevation view in cross section of componentelements of the invention prior to locking engagement of the elements.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawingsand particularly FIG. 1, a portion of a gyratory crusher for comminutingis illustrated generally at 10. The crusher comprises a crushing head 12having a wearable mantle liner 14 mounted for gyratory movement withinbowl 16. Material to be crushed is fed through hopper 18 into the spacebetween the bowl and crushing head.

Bowl 16 comprises a generally cylindrical outer section 20 and agenerally frustoconical inner section 22. A threaded portion 23 on bowlsection 20 engages an adjustment ring mounted on a main frame, notshown.

A frustoconical bowl liner 24 constructed of a wearable material such asmanganese steel is removably mounted within bowl section 22. A suitablebacking material 26, such as zinc or epoxy, may be placed between thebowl and liner 24, as is well known. The bowl liner is formed with anupwardly and outwardly extending locking flange 28.

The bowl liner is locked to the bowl by means of a plurality of lockingmembers 30 circumferentially disposed around the liner. In the preferredembodiment, each locking member may be formed with an inwardlyprojecting wedge-shaped nose portion 32 and an upstanding yoke 34 havingradially extending apertures 36 and 38, as best shown in FIG. 2.

Each of the locking members 30 is mounted for radial movement on a ledge40 of the bowl and an annular plate 42 secured between the inner andouter bowl sections. The sides of the locking member move withinchannels 51 and 44 formed in inner bowl section 22; this functions toprevent twisting of the locking member during the crushing operation.

Nose portion 32 of the locking member is in locking engagement withsurface 46 formed on liner flange 28. Inward thrust of member 30 againstthe flange urges liner 24 upwardly against bowl 22 and backing material26.

The upper and inner end of bowl section 22 may be formed with an annularcofferdam portion 48 formed with radially extending channels 51 toreceive the nose portions of respective locking members. Cofferdamportions 48 function to prevent cold flow of the liner flange duringcrushing, which otherwise would make removal of the liner from the bowlextremely difficult.

Each of the locking members is held in locking engagement with the linerflange by means of a destructible support element 50 positioned radiallybetween the inner surface of bowl section 20 and the outer end of thelocking member. Element 50 is preferably fabricated from a relativelynonyieldable material, such as carbon steel bar stock. A support member52 formed with an apertured aligning socket 53 may be secured to theinner surface of bowl section 20 to support the outer end of element 50in alignment with the locking member.

The inner end of each support element 50 is preferably mounted with arespective locking member 30 by means of a threaded bolt 54 aligned withyoke apertures 36 and 38. Alternatively, the support element may be inthrust receiving relationship with the locking member with the boltbeing positioned between the outer bowl section and the outer end of thesupport element. A thrust nut 56 threadably engages bolt 54 constitutingtherewith a power means and is restrained from rotation within the twoarms of the yoke. A driving arrangement, such as socket 58, may beprovided to turn bolt 54 by suitable means such as an impact wrench. Theouter end of each bolt is preferably formed with an enlarged portion 60formed with a socket 62 for removably receiving the inner end of element50. Socket 62 is of sufficient depth to prevent the end of element 50from working loose due to twisting forces imparted thereto by lockingmember 30.

With liner 24 positioned adjacent bowl l6 and with backing material 26in place, assembly of the lock elements may proceed as follows. Bolt 54is turned by a wrench and moved inwardly relative tolocking member 30,which may be loosely positioned on the bowl against the liner flange 28.Support element 50 is next inserted into either one of the sockets 53 or62 and bolt 54 is then turned to move outwardly and take up the slackbetween bowl section 20, support element 50, and the bolt. The elementswould thus be positioned as shown in FIG. 2. Further turning of the boltwill produce the desired locking force against liner flange 28.

When the liner is worn to the extent that replacement is necessary, thelocking elements may be rapidly removed to unlock liner 24 by destroyingthe disposable support elements. This may be accomplished by anysuitable means, such as by cutting element 50 with an acetylene cuttingtorch applied through gap 63 between support member 52 and bolt portion60. it may then be necessary to strike locking member 30 with severalblows of a hammer to loosen nose 32 from underneath liner flange 28.After this, the locking member will easily slide outwardly on ledge 40and plate 42 to permit removal of liner 24 from bowl l6. 7

It is apparent that applicant has provided a locking device which willrapidly unlock the liner from the bowl of a gyratory crusher. Thisunlocking can be accomplished in a much shorter time span as compared tolocking devices in which, for

example, a bolt is used to advance the locking member from underneaththe liner flange and in which the bolts may bind to make unlockingextremely difflcult. Moreover, with applicants device the lockingassembly may be readily reassembled with a new liner by the replacementof a new support element, which is an inexpensive and expendable part.Locking member 30, bolt 54, and thrust nut 56 may be reused throughoutan indefinite number of liner replacements.

it will be understood that various changes in the details, material, andarrangement of parts, which have been described and illustrated in orderto explain the nature of the invention, may be made by those skilled inthe art within the principle and scope of the invention as expressed inthe appended claims.

I claim:

1. A liner locking device for use with a gyratory crusher having acrushing head mounted for movement within a bowl and a bowl linermounted between the bowl and the head, the liner having a lockingflange, the locking device comprising the combination of: a plurality oflocking members mounted on the bowl, each mounted for generally radialmovement toward and away from the locking flange on the liner to lockand unlock the liner in the bowl; power means for moving the lockingelements inwardly to engage the locking flange and lock the liner in thebowl; and an elongated, destructible, expendible element separate fromand engaging the power means, said destructible element having an endface adapted to receive the thrust of the power means when the liner islocked in the crusher and to normally preclude unlocking movement of thelocking member whereby destruction of the destructible element permitsfree outward movement of the locking member tending to unlock the liner,

2. The invention as defined in claim 1 and further characterized in thatthe locking member includes wedge means positioned under the flange tourge the liner upwardly against the bowl upon movement of the member tothe liner.

3. The invention as defined in claim 1 and further characterized in thatthe power means comprises a radially aligned bolt threadably engagedwith the locking member, said bolt being in thrust receivingrelationship at its outer end with the inner end of the destructibleelement.

4. The invention as defined in claim 3 and further characterized in thatthe outer end of the bolt is provided with a socket, said socket havinga radially aligned, outwardly facing opening, said destructible elementbeing removably mounted in the opening of said socket.

5. The structure of claim 1 further characterized by and including asocket member secured to the bowl, the destructible element comprising aradially aligned bar removably mounted at its outer end in the socketmember.

6. The structure of claim 1 further characterized in that each of-thelocking elements slides in a generally radially disposed channel in thebowl.

